KR20190037078A - Nitrogen removal system for sewage and wastewater comprising nitrogen - Google Patents

Abstract

The present invention relates to a nitrogen removal system contained in sewage and wastewater, which comprises: a reactor for removing ammonia nitrogen contained in sewage and wastewater; a cyclone unit for separating anaerobic microorganisms and aerobic microorganisms of sewage and wastewater introduced from the reactor to discharge the same as circulated water and treated water; and a sulfated denitrification device for removing nitrate nitrogen of the treated water discharged by the cyclone unit. The cyclone unit includes: a water collecting tank for collecting sewage and wastewater discharged by the reactor; a plurality of distribution nozzles connected to eject the sewage and wastewater stored in the water collecting tank; a plurality of cyclones separately connected to the distribution nozzles to separate the ejected sewage and wastewater into the anaerobic microorganisms and the aerobic microorganisms by the gravity difference caused by vortex; a plurality of overflow pipes separately connected to discharge the treated water containing the aerobic microorganisms separated by the cyclones to the sulfated denitrification device; and a plurality of underflow pipes separately connected to discharge the circulated water containing the anaerobic microorganisms separated by the cyclones to the reactor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nitrogen removal system for wastewater,

The present invention relates to a nitrogen removal system contained in a wastewater, and as a domestic priority claim for a Korean patent application No. 10-2016-172345 (filed on December 16, 2016), a nitrogen removal system having low C / N ratio and ammonia It is a technology for the treatment of wastewater containing a lot of nitrogen. More specifically, a cyclone is used to recover anaerobic ammonium oxidizing bacteria (granule formation), which is a microorganism having a high specific gravity, and media having mainly aerobic ammonia oxidizing bacteria attached thereto, and the microorganisms (mainly nitrite oxidizing bacteria) Circulated or treated water. Also, the present invention relates to a nitrogen removal system that can increase the total nitrogen treatment efficiency more economically than conventional anaerobic ammonia oxidation techniques by removing nitrate nitrogen generated in the ammonia oxidation process by the anaerobic ammonia oxidizing bacteria.

The anaerobic digestion facility that produces energy by converting the organic matter contained in the high concentration organic wastes such as sludge discharged from the sewage treatment plant, food waste, livestock manure into methane gas has the advantages of waste reduction and energy production, The ammonia nitrogen contained therein also flows into the main stream of the wastewater treatment plant due to elution, thereby increasing the nitrogen load.

In order to solve this problem, it is necessary to increase the processing capacity of the main process of the sewage treatment plant or reduce the nitrogen load flowing into the sewage treatment plant through the side stream. However, in most sewage treatment plants, it is not easy to increase the treatment capacity because there is no space on the site, and in order to increase sewage treatment capacity, a great cost is required.

On the other hand, the method of directly treating nitrogen with the reflux water containing the anaerobic digestion decant is simpler and more economical than adding this treatment capacity.

There is a problem that it is difficult to reduce the treatment facility capacity by the conventional nitrification-denitrification technology. Various technologies have been developed worldwide to solve this problem in the late 1990s. Recently, facilities for removing high-concentration ammonia nitrogen (NH ₄ -N) have been installed in Europe, USA and Japan.

A new technology that can remove ammonia nitrogen (NH ₄ -N) that is attracting attention is ANAMMOX.

Anamox technology is a reaction carried out by anaerobic bacteria, an autotrophic organism that synthesizes cells from inorganic carbon using ammonia (NH ₄ ⁺ ) and nitrite (NO ₂ ^- ) as substrates in anaerobic conditions, It is also referred to as oxidation (anaerobic AMMONIUM OXIDATION) or deammonification.

Anamox technology is an autotrophic reaction in which NH ₄ ⁺ reacts as an electron donor and NO ₂ ^- reacts as an electron acceptor in an anaerobic state to produce nitrogen gas. It requires very little oxygen for nitrification compared to existing nitrification- The supply of the organic carbon source is not required, and the treatment cost is greatly reduced.

In order to remove the nitrogen component by the Anammox reaction, the concentration of ammonia nitrogen (NH ₄ -N) and nitrite nitrogen (NO ₂ -N) should be introduced into the anamox reaction tank at a ratio of about 50:50.

That is, aerobic ammonia oxidation (ammonia oxidation) that converts ammonia nitrogen (NH ₄ -N) present in the source water to ammonia oxidizing bacteria (AOB) into aerobic nitrite nitrogen (NO ₂ -N) ammonium OXidation) or nitrification (nitrification).

Since ammonia (NH ₄ ⁺ ) and nitrite (NO ₂ ^- ) should be present at a molar ratio of 1: 1.32 as shown in the following reaction equation, only about 50 to 55% of nitrite must be converted into nitrite nitrogen. (Partial Nitritation).

The reaction of nitrite and anamox is as follows.

Nitrification: 2NH ₄ ⁺ + 1.5O ₂ → NH 4 ⁺ + NO ₂ ^- + H ₂ O + 2H ⁺

Anammox reaction: 1.0NH ₄ ⁺ + 1.32NO ₂ ^- + 0.066HCO ₃ ^- + 0.13H ⁺

→ 1.02N ₂ + 0.26NO ₃ ^- + 0.066CH ₂ O _{0 . 5} N _{0 .15} (biomass) + 2.03H ₂ O

Here, 0.066 CH ₂ O _{0 . 5} N _{0 .15} (biomass) represents anammox bacteria.

By applying the Anamox technology to the removal of ammonia nitrogen from the reflux water, the initial investment, operating cost, site area, energy consumption, and CO ₂ emissions are reduced by more than 30 to 60% compared with the existing ammonia nitrogen treatment method.

The first Anamox technology is a so-called 2-nitrification process that separates half of the ammonia nitrogen present in the raw wastewater into nitrite nitrogen (partial nitrite oxidation) and ananomos reaction tank which treats it with anammox microorganism It was applied to demonstration facilities in the form of a two stage or two tank system reactor. It was then developed as a one-stage or one tank system reactor in which a partial nitrification and anammox reaction was carried out in a single reactor. 1 Breakfast Anamox technology does not require sedimentation tank compared with 2-bed technology, and it has the advantage of drastically reducing the reaction tank because it performs partial nitrification and anammox reaction in a single reaction tank. Therefore, in recent years, the one-breakfast Anamus technology has been applied to the economy because it can reduce the initial investment cost of the installation site, piping, and pump.

1 Breakfast Anamox technology is characterized by simultaneous partial nitrification and anammox reaction in a single reaction tank. Therefore, ammonia oxidizing bacteria and anammox bacteria should be present in a proper ratio in the reaction tank, and other microorganisms should be removed from the reaction tank by washing out from the reaction tank or inhibiting the activity. To achieve this, operation control using various operating factors such as pH, SRT, DO, temperature, Free Ammonia (FA) and Free Nitrous Acid (FNA) is required.

In particular, since the growth rate of anammox is very slow, it must be kept in the reaction vessel without loss after once feeding, while nitrite oxidizing bacteria (NOB) should be selectively released. To achieve this, in the case of the two-breakfast process, a settling tank is installed at the downstream of the partial nitrification tank and the Anamox reaction tank, and the Anammox bacteria are recovered through transportation.

1 In the case of the breakfast process, an immersion membrane is used to separate the treated water and the sludge, or the tank is constructed in the form of an upflow tank using anamox bacteria that forms a granule, It can also be applied as a reaction tank in which the granules lose floating microorganisms during rapid settling. However, these methods have the disadvantage that the site for the settling tank becomes big, the membrane installation and operation cost is high, and the built-up material such as the swash plate is needed to prevent the loss of the granules to the outside in the tower type reactor, . Therefore, more economical technology is needed to solve this problem.

Even when ammonia nitrogen is treated by the Anamox reaction, about 10% of nitrate nitrogen is left as a product compared to ammonia nitrogen which is removed. Therefore, in order to increase the total nitrogen removal efficiency, a subsequent process for completely removing the remaining nitrate nitrogen is required. In general, nitrate nitrogen can be removed by denitrification by heterotrophs. However, in the case of anaerobic digestion liquid, since most of the organic matter is consumed as biogas and the residual amount is not high, an external carbon source such as methanol should be additionally supplied, thereby increasing the amount of sludge generated. This method will soon lead to an increase in operating costs, so a more economical method for treating residual nitrogen is needed.

Korean Registered Patent No. 1288495 (registered on July 16, 2013) Korean Registered Patent No. 1288503 (registered on July 16, 2013) Korean Registered Patent No. 1430722 (registered on August 08, 2014) Korean Patent No. 0586535 (registered on May 26, 2006)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for operating a single-bed anammox process more economically and stably without installing a settling tank or membrane filtration. In other words, it is important to keep the aerobic ammonia oxidizing bacteria and anammox bacteria in the reactor well, and the nitrite oxidizing bacteria should be discharged to the outside of the reactor. To this end, aerosol aerobic bacteria are adhered and grown mainly by feeding the media, which are recovered in the reaction tank together with the anaerobic ammonia oxidizing bacteria (granules) using a cyclone. Microorganisms not attached to median granules and having a low specific gravity are selectively discharged into circulating or treated water. The present invention also provides a nitrogen removal system that can increase the total nitrogen treatment efficiency more economically than the conventional anaerobic ammonia oxidation technique by removing the nitrate (remaining) nitrogen generated in the ammonia oxidation process by the anaerobic ammonia oxidizing bacteria.

In order to achieve the above object, the nitrogen removal system contained in the wastewater according to the present invention comprises a reactor for removing ammonia nitrogen contained in the wastewater, an anaerobic ammonia oxidizing bacteria granule fed from the reactor, And a cyclone unit for removing nitrate nitrogen from the treated water discharged from the cyclone unit, wherein the cyclone unit comprises: a cyclone unit for recovering nitrate nitrogen from the cyclone unit; A water collecting tank for collecting waste water discharged from the reactor, a plurality of distribution nozzles connected to discharge the waste water / wastewater stored in the water collecting tank, and a connection pipe provided with valves for regulating the supply amount and pressure of the waste water to the plurality of distribution nozzles, respectively The anaerobic ammonia oxidizing bacteria granules having a high specific gravity as a difference in specific gravity by vortex and A plurality of cyclones separated into aerobic microorganisms such as a medium adhered with aerobic ammonia oxidizing bacteria and a nitrite oxidizing bacteria having low specific gravity, a plurality of overflow pipes respectively connected to discharge the treated water separated from the plurality of cyclones to the sulfuric acid denitrifier, And a plurality of underfloor pipes respectively connected to discharge the circulating water containing the anaerobic ammonia oxidizing bacteria granules separated from the cyclone and the medium having the aerobic ammonia oxidizing bacteria to the reactor.

In the system of the present invention, the sulfuric acid denitrifier includes a storage tank for storing the treated water discharged from the overflow pipe, a denitrification tank for containing treated water discharged from the storage tank after the sedimentable microorganisms are removed, And a denitrifier blower for supplying air for backwashing the sulfuric acid denitrification carrier.

At this time, the denitrification tank may be connected to a circulation pump that removes nitrate nitrogen by the sulfation denitrification carrier and reintroduces the treated water raised to the top of the denitrification tank to the bottom.

In the system of the present invention, the cyclone unit may further include a reservoir for storing the treated water discharged from each of the overflow pipes.

At this time, one end of the overflow pipe may be connected to the upper discharge port of the cyclone, and the other end may be bent downward and connected to the reservoir disposed at the lower part of the water collecting tank.

In the system of the present invention, the cyclone is connected to a distribution nozzle through a connection pipe, and a valve is provided in the connection pipe to control the supply amount and pressure of the waste water and wastewater.

In the system of the present invention, a part of the plurality of overflow pipes may discharge part of the treated water containing the aerobic microorganisms separated from the plurality of cyclones to the reactor as circulating water.

According to the present invention embodied by the above-described means, since the ammonia nitrogen of the waste water and wastewater is removed by the Anamox reactor, and the nitrate nitrogen is continuously removed by the sulfation denitrifier, the remaining nitrite The total nitrogen concentration in the treated water can be remarkably lowered and the anaerobic microorganisms forming the granules by the cyclone unit and the ammonia oxidizing bacteria attached to the medium can be separated by the specific gravity difference, Nitrite oxidant is discharged.

Thus, it is possible to prevent the loss of ammonia oxidizing bacteria and anaerobic bacteria and control excessive conversion of nitrite nitrogen into nitrite nitrogen by discharging nitrite oxidizing bacteria, thereby preventing deterioration of nitrogen treatment efficiency and stable operation of the 1-anammox process There is a very useful effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram showing an overall process of a nitrogen removal system contained in a wastewater according to an embodiment of the present invention; FIG.
2 is a three-dimensional perspective view of a cyclone unit according to an embodiment of the present invention.
3 is a cross-sectional view of a cyclone unit according to an embodiment of the present invention.
4 is an operational view showing the operation of the cyclone unit according to the embodiment of the present invention.
Fig. 5 is a view showing an image taken on a wastewater according to an embodiment of the present invention
6 is an image of a circulation water of an underflow pipe according to an embodiment of the present invention.
7 is an image of the number of treated water of the overflow pipe according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings in order to fully understand the present invention.

The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention.

Therefore, the shapes and the like of the constituent elements shown in the drawings may be exaggerated in order to emphasize a clearer explanation. It should be noted that the same components are denoted by the same reference numerals in the drawings. Further, the detailed description of functions and configurations of known technologies which are considered to be unnecessarily obscuring the gist of the present invention will be omitted.

The nitrogen removal system contained in the wastewater according to the present invention comprises a reactor (100) for removing ammonia nitrogen contained in the wastewater or wastewater, anaerobic microorganisms of the wastewater fed from the reactor (100) and an aerobic microorganism A cyclone unit 200 for discharging the treated water discharged from the cyclone unit to the circulating water and treated water, and a sulfuric acid denitrifier 400 for removing nitrate nitrogen from the treated water discharged from the cyclone unit.

The reactor 100 removes ammonia nitrogen contained in the waste water and wastewater. The reactor 100 includes a reaction tank 110 for storing waste water and wastewater, and a micro-acid substrate 122 installed in the reaction tank 110, And a circulating water pump 130 for discharging the ammonia nitrogen-removed bottom wastewater from the reaction tank 110 to the cyclone unit 200.

The reaction tank 110 is formed into a rectangular cylinder or a cylindrical shape, and contains waste water and wastewater containing a high concentration of ammonia nitrogen. The reaction tank is filled with aerobic and anaerobic microorganisms, anaerobic ammonia oxidizing bacteria granules with sludge containing aerobic and anaerobic microorganisms, media with sludge containing aerobic and anaerobic microorganisms. Here, the aerobic and anaerobic microorganisms may include aerobic ammonia oxidizing bacteria, aerobic nitrification bacteria, aerobic heterotrophic bacteria, anaerobic heterotrophic bacteria, and anaerobic ammonium oxidizing bacteria (before granule formation).

The medium functions to stably maintain the amount of microorganisms in the reaction tank 110. This medium is formed to a size of 0.5 mm or less and is not sensitive to pH, temperature and UV ultraviolet rays, and is sensitive to mechanical shear stress or biological or chemical influences Not only excellent durability but also good sedimentation and fixability (adhesion ability). In addition, Media has a sludge deposition capacity of more than 5 kg / kg-media and can hold and maintain sludge more than five times that of suspended sludge. In addition, on the surface of the media, sludge containing the aerobic and anaerobic microorganisms mentioned above, that is, aerobic ammonia oxidizing bacteria and aerobic nitrification bacteria and aerobic heterotrophic bacteria and anaerobic heterotrophic bacteria and anaerobic ammonia oxidizing bacteria before granulation are adhered.

Unlike aerobic ammonia oxidizing bacteria, aerobic nitrifying bacteria, aerobic heterotrophic bacteria, and anaerobic heterotrophic bacteria, anaerobic ammonia oxidizing bacteria granules grow in granule form with entanglement of the bacteria . The anaerobic ammonia oxidizing bacteria granules are in the form of granules having a size of about 0.1 to 3 mm and are filled in the reaction tank 110. The aerobic and anaerobic microorganisms mentioned above, Sludge containing heterotrophic bacteria and anaerobic ammonium oxidizing bacteria before granulation is attached.

The blower 120 supplies air to the micro-acid substrate 122 installed on the inner bottom of the reaction tank 110. The air supplied from the blower 120 causes the bottom / wastewater in the reaction tank 110 to undergo nitrification only Aerobic condition is achieved.

The circulating water pump 130 discharges aerobic and anaerobic microorganisms, anaerobic ammonia granules, and medicament-containing bottom wastewater, which are installed inside the reaction tank 110, to the cyclone unit 200, from which ammonia nitrogen has been removed. By this circulating water pump 130, the inflow amount of the waste water and the internal pressure of the cyclone unit 200 are regulated.

The cyclone unit 200 separates anaerobic microorganisms and aerobic microorganisms of the wastewater flowing into the reactor 100 from the difference in specific gravity by vortex and discharges them in the form of circulating water and treated water. As shown in FIGS. 2 and 3, the cyclone unit includes a water collecting tank 210 for collecting the waste water discharged from the reactor 100, a plurality of distribution nozzles (not shown) connected to jet the waste water, A plurality of cyclones 230 for separating the lower wastewater discharged from the plurality of distribution nozzles 220 into anaerobic microorganisms and aerobic microorganisms by the difference in specific gravity by vortex and discharging them as circulating water and treated water, An overflow pipe 240 for discharging the treated water containing the aerobic microorganisms discharged from the cyclone of each of the overflow pipes 240 to the sulfation denitrifier 400, And an underflow pipe 260 for discharging the circulating water containing the anaerobic microorganisms discharged from the plurality of cyclones 230 to the reactor 100.

Here, a part of the plurality of overflow pipes 240 is a part of the treated water containing the aerobic microorganisms separated from the plurality of cyclones 230 as the circulating water, not the reactor 100, To be reintroduced into the system.

That is, some of the plurality of overflow pipes 240 are connected to the reactor 100.

The water collecting tank 210 is formed in a cylindrical shape to collect bottom and wastewater. An inlet 212 is formed in the upper part of the water collecting tank 210 to allow the bottom / waste water discharged from the reactor 100 to flow.

The distribution nozzles 220 are radially connected to the center of the water collecting vessel 210 to uniformly discharge the wastewater in the water collecting vessel 210.

The cyclone 230 is connected to the plurality of dispensing nozzles 220, and separates and discharges anaerobic microorganisms and aerobic microorganisms contained in the wastewater or wastewater by specific gravity difference. 3, the cyclone 230 is composed of an upper cylindrical portion 232 and a lower conical portion 234. An upper discharge port 233 is formed at the center of the upper end of the cylindrical portion 232, A lower discharge port 235 is formed at the center of the lower end of the discharge port 234. A supply port 236 is formed at one side of the upper portion of the cylindrical portion 232 and connected to the distribution nozzle 220 through a connection pipe 237. The ammonia nitrogen is removed through the supply port 236, Waste water is supplied. In addition, a valve 238 is provided in the connection pipe 237 to regulate the supply amount and pressure of the wastewater and the wastewater. Such a valve is preferably implemented as a ball valve for finely controlling the supply amount and the pressure of the wastewater. , And can be implemented with various valves that can control the supply amount and pressure of the waste water and wastewater as needed. In addition, a plurality of projections 239 are formed on the inner surface of the cyclone 230 so as to be spaced apart from each other along the circumference and the axial direction, so that the sludge adhering to the surface of the granulated anaerobic ammonium oxidizing bacteria is removed, Separated from the wastewater and descended.

The overflow pipe 240 is connected to the upper discharge port 233 of the plurality of cyclones 230 to discharge the treated water containing aerobic microorganisms to the storage tank 250. One end of the overflow pipe 240 Connected to the upper outlet 233 of the cyclone 230 and the other end is gently curved downward and connected to the open top of the reservoir 250.

Here, some of the plurality of overflow pipes 240 are connected to the upper part of the reactor 100 through the open top of the reactor 100.

The storage tank 250 stores the process water discharged from each overflow pipe 240. The storage tank 250 is formed into a cylindrical shape having an open upper portion so that the process water discharged from the overflow pipe 240 is stored And a discharge port 252 is formed in the lower center thereof to discharge the treated water to the sulfuric acid denitrifier 400. The storage tank 250 is disposed at a lower portion of the water collecting tank 210. The water collecting tank 210 is supported and fixed by a plurality of first brackets 254 installed at intersections of the upper center of the storage tank 250. In addition, a plurality of second brackets 256 are radially provided at the outer peripheral edge of the reservoir 250 to support and fix the lower portions of the plurality of cyclones 230, respectively. In addition, the reservoir may further include a drain valve 258 installed at the lower side to discharge the treated water.

The underflow pipe 260 is connected to the lower outlet 235 of the plurality of cyclones 230 to discharge the circulating water containing anaerobic microorganisms. 1 and 3, one end of the underflow pipe 260 is connected to the lower discharge port 235 of the cyclone 230, and the other end thereof is bent and connected to the open top of the reaction tank 110.

The sulfuric acid denitrifier 400 removes the nitrate nitrogen contained in the treated water collected in the primary treatment water tank 300 after being discharged from the cyclone unit 200. This sulfuric acid denitrator is an ammonia- A denitrification tank 420 for containing the treated water discharged from the storage tank 410 after the precipitable microorganisms are removed from the storage tank 410 and a nitrification tank 420 for filling the denitrification tank 420 with sulfuric acid And a denitrifier blower 440 for supplying air to the denitrification tank 420. The denitrifier blower 440 includes a plurality of exhaust pipes.

The storage tank 410 stores the treated water treated in the primary treatment tank 300 by the treatment water pump 450. The storage tank 410 can uniformly introduce the treated water into the denitrification tank 420 (Microorganisms having a large specific gravity) precipitated in the treated water to the bottom of the storage tank, thereby reducing the concentration of the solids flowing into the denitrification tank 420.

The denitrification tank 420 is formed into a rectangular tube or a cylindrical shape so that microorganisms which can be precipitated in the storage tank 410 are removed, and the treated water discharged is discharged.

The sulphated denitrifying carrier (430) is filled in the denitrifying tank (420) to maintain the pH of the denitrifying microorganism and adjust pH thereof. The sulphated denitrifying carrier (430) The nitrate nitrogen contained therein is removed by denitrification. That is, in the treated water passing through the cyclone unit 200, about 10% of nitrate nitrogen is generated relative to the nitrogen concentration treated in the reactor 100, and this nitrate nitrogen is converted into sulfuric acid denitrification .

The denitrifier blower 440 supplies air to a lower portion of the denitrification tank 420, and air supplied from the denitrifier blower 440 is installed for backwashing the denitrification tank.

That is, intermittent backwashing is performed in order to prevent channeling phenomenon in which the pores are blocked due to the growth of denitrifying microorganisms adhered between the carriers and the carriers and wastewater are not evenly contacted and moved to one side.

In addition, the sulfuric acid denitrifier (400) further includes a circulation pump (460) for removing nitrate nitrogen by the sulfation denitrifying carrier (430) and reintroducing the treated water raised to the upper portion of the denitration tank (420) .

As described above, the treated water from which the nitrate nitrogen has been removed by the sulfation denitrifier (400) is discharged through the secondary treatment water tank (500).

The overall operation and effect of the present invention thus constructed will be described in detail with reference to the accompanying drawings.

First, the reactor 110 of the reactor 100 is filled with anaerobic ammonia granules with sludge containing aerobic and anaerobic microorganisms, aerobic and anaerobic microorganisms, media loaded with sludge containing aerobic and anaerobic microorganisms, The bottom and wastewater containing ammonia nitrogen is continuously introduced into the reactor 110.

Subsequently, an appropriate amount of air is supplied into the reaction tank 110 through the micro-acid substrate 122 by the operation of the blower 120 to convert a part of the ammonia nitrogen into nitrite nitrogen by the aerobic oxidizing bacteria contained in the sludge do.

When the supply of air into the reaction tank 110 is stopped by stopping the operation of the blower 120, the inside of the reaction tank 110 is subjected to an anaerobic condition. Thereafter, a stirring vane (not shown) is operated to oxidize the medium and the anaerobic ammonia oxidation When the bacteria granules are stirred in the reaction tank 110, the ammonia nitrogen and the nitrite nitrogen are oxidized by the anaerobic ammonia oxidizing bacteria by the anaerobic ammonium oxidizing bacteria (before being granulated) contained in the anaerobic ammonia oxidizing bacteria granules and the sludge, And the anaerobic ammonia oxidizing bacteria grow.

Thus, the wastewater from which ammonia nitrogen has been removed contains anaerobic ammonia granules with sludge containing aerobic and anaerobic microorganisms, and media with sludge containing aerobic and anaerobic microorganisms.

Fig. 5 (a) is an image of the lower and wastewater treated in the above-described process in a measuring cylinder, and Fig. 5 (b) is an image of the lower and wastewater contained in the measuring cylinder enlarged by a microscope. In FIG. 5 (b), anaerobic microorganism Ananomycetes is represented by a red circle and aerobic microorganism is represented by a blue circle.

The lower wastewater containing these components is discharged to the cyclone unit 200 by the operation of the circulating water pump 130.

The waste water flowing into the water collecting tank 210 through the inlet 212 of the cyclone unit 200 is discharged into the respective cyclones 230 through the plurality of dispensing nozzles 220 and discharged into the cyclone 230 The jetted wastewater flows downward along the cylindrical portion 232 and descends to the conical portion 234 and rises to the center portion.

At this time, the anaerobic ammonia oxidizing bacteria granule collides with the protrusions 239 of the cyclone 230, and the sludge is separated and separated by the descending line recirculation. The media collides with the protrusions 239 to be separated from the sludge after being separated, . Namely, anaerobic microorganisms (anaerobic ammonia oxidizing bacteria granules and medias) having a large specific gravity contained in the lower wastewater fed into the cyclone 230 and containing anammox bacteria are lowered by a descending swirl flow (solid line arrow in FIG. 4) Passes through the lower outlet 235, is discharged through the underfloor pipe 260, and then is introduced into the reactor 110 of the reactor 100 in the form of circulating water. 6 is an image of the circulating water discharged through the underflow pipe 260 in a measuring cylinder.

On the other hand, the aerobic microorganisms (ammonia oxidizing bacteria and nitrite oxidizing bacteria) having a small specific gravity are passed through the upper discharge port 233 by the upward swirling flow (dotted arrow in FIG. 4) rising to the center of the cyclone 230, And stored in the storage tank 250 and then introduced into the primary treatment water tank 300 in the form of treated water. FIG. 7 is an image of the treated water discharged through the overflow pipe 240 in a measuring cylinder.

Here, a part of the treated water is not stored in the storage tank 250 but is returned to the reactor 100 as circulating water.

As described above, the treated water treated in the primary treatment water tank 300 flows into the storage tank 410 by the operation of the treatment water pump 450.

The treated water which has been precipitated by the microorganisms having a large specific gravity in the storage tank 410 is introduced into a lower portion of the denitrification tank 420 filled with the sulfated denitration carrier 430.

At this time, the nitrate nitrogen remaining in the treated water is removed by the sulfuric acid denitrification reaction of the sulfuric acid denitrifying carrier 420 filled in the denitrifying tank 410.

Thus, the treated water from which the nitrate nitrogen has been removed by the sulfation denitrifier (400) is discharged to the secondary treatment water tank (500).

Alternatively, the nitrate nitrogen is removed by the sulfuric acid denitrifier 400 and the treated water raised to the top of the sulfated denitrifying carrier 430 is recycled to the lower portion of the denitrification tank 420 by the circulation pump 460 .

In addition, by operating the denitration blower 440, air can be supplied into the denitrification tank 420 to perform intermittent backwashing.

It will be apparent to those skilled in the art that various modifications and equivalent arrangements may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Therefore, it is to be understood that the present invention is not limited to the above-described embodiments.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

100: Reactor 110: Reactor
120: Blower 130: Circulating water pump
200: Cyclone unit 210: Water collecting tank
220: dispense nozzle 230: cyclone
240: overflow pipe 250: storage tank
260: underflow pipe 300: primary treatment tank
400: Sulfuric acid denitrifier 410: Storage tank
420: denitrification tank 430: sulfuric acid denitrification carrier
440: denitrifier blower 500: secondary treatment water tank

Claims (5)

A reactor for removing ammonia nitrogen contained in the waste water and wastewater, an anaerobic ammonia oxidizing bacteria granule introduced from the reactor, and a medium adhered with aerobic ammonia oxidizing bacteria are recovered as circulating water to a reactor, and aerobic microorganisms such as nitrite oxidizing bacteria are treated A cyclone unit for discharging water to the cyclone unit, and a sulfuric acid denitrifier for removing nitrate nitrogen of the treated water discharged from the cyclone unit,
The cyclone unit includes a water collecting tank for collecting waste water discharged from the reactor, a plurality of distribution nozzles for discharging waste water stored in the water collecting tank, and a control unit for controlling the supply amount and pressure of the waste water to the plurality of distribution nozzles Separate the discharged wastewater into aerated microorganisms such as anaerobic ammonia oxidizing bacteria granules and anaerobic ammonium oxidizing bacteria with high specific gravity and nitrite oxidizing bacteria with low specific gravity as the difference of specific gravity by vortex. A plurality of overflow pipes each connected to discharge the treated water separated from the plurality of cyclones to the sulfation denitrifier, a plurality of overflow pipes separated from the plurality of cyclones, a plurality of the anaerobic ammonia oxidizing bacteria granules separated from the plurality of cyclones, To discharge the circulating water containing the < RTI ID = 0.0 > Of and including the underflow pipe,
Wherein the sulfuric acid denitrifier comprises: a storage tank for storing the treated water discharged from the overflow pipe; a denitrification tank into which the treated water from which the microorganisms with a large specific weight is removed flows; and a nitrification tank that is filled with the denitrification tank to remove nitrate nitrogen And a denitrifier blower for supplying air for backwashing the sulfuric acid denitrification carrier. The method according to claim 1,
Wherein the denitrification tank is connected to a circulation pump for removing nitrate nitrogen from the sulfated denitrification carrier and reintroducing the treated water raised to the top of the denitrification tank to the bottom. The method according to claim 1,
Wherein the cyclone unit further comprises a reservoir for storing the treated water discharged from each of the overflow pipes. The method of claim 3,
Wherein one end of the overflow pipe is connected to the upper discharge port of the cyclone and the other end is bent downward and connected to the storage tank disposed at a lower portion of the water collecting tank. The method according to claim 1,
Wherein some of the plurality of overflow pipes discharge a part of the treated water containing aerobic microorganisms separated from the plurality of cyclones to the reactor as circulating water.

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